Reply by LAW

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Posted on scroll saw blade clamps driving me nuts

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11 posts in 434 days

#1 posted 03-03-2020 03:46 AM

Look closely at the two clamping blocks. The inner one has hole through it for the bolt. Outer one is plain square with threaded hole the the screw tightens into. The inner one has a raised flange on the back edge, parallel to the blade. The blade is placed up near and in front of the screw.
If the inner block is backwards with the flange towards the front, it will never tighten on the blade. If the inner block has been removed and put in with the flange to the outside, facing the screw head, the outer block will be cocked on the blade and will not hold.
If both blocks are installed properly, the outer block has the back edge held out by the flange and the front edge is clamped against the blade. Since the block is now parallel to the inner block surface it has full contact to the blade and should hold it securely.

My saw had the threads in the outer block stripped from over tightening. I made new clamping nut with piece of 1/4” steel, 1/2” square with (I think) 10-32 thread. If you have to make a new square nut, make and thread the hole first and then cut and finish filing the outer edges to the 1/2” dimensions. To insure it is in the center, place the nut into the clamping part and see if the screw will go into the hole without interference. Trial and error but it is possible to get a very good fitting nut. The original nuts may have been hardened but were thinner than 1/4”, it should hold up very well. Don’t oil the threads.

-- LAW, Midland MI

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